<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>

<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<body>
    <!--准备好一个"容器"-->

    <div id="test"></div>

    <!--引入库-->
    <script type="text/javascript" src="../js/react.development.js"></script>
    <script type="text/javascript" src="../js/react-dom.development.js"></script>
    <script type="text/javascript" src="../js/babel.min.js"></script>


    <script type="text/babel">


        class Time extends React.Component {

            state = {date:new Date()}

            componentDidMount(){
                setInterval(() => {
                    this.setState({
                        date:new Date()
                    });
                }, 1000);
            }

            render() {
                return(
                    <div>
                        <h1>Hello World</h1>
                        <input type="text"/>
                        <span>现在是:{this.state.date.toTimeString()}</span>
                        </div>
                )
            }
        }

        //2.渲染虚拟DOM到页面
        ReactDOM.render(<Time/>, document.getElementById('test'));
    </script>

</body>

</html>